Question

If x = - 5 ,^ is 2 and y = - 8 , evaluate a) 2xy^ 2 b)5x^ 9
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Answer 1

Answer:

$a) {2xy}^{2}$

$=( x = { - 5}^{2} )(y = - 8)$

$= {(2 \times ( { - 5}^{2} }) \times - 8)^{2}$

$= {(2 \times (10) \times - 8)}^{2}$

$= {(20 \times - 8)}^{2}$

$= { - 160}^{2}$

$= 256$

$b) {5x}^{9}$

$= ({5} \times ( { - 5}^{2}) ^{9}$

$= ( {5} \times (10))^{9}$

$= {50}^{9}$

$= 1953125000000000$